Tank car liquid unloading monitoring system and monitoring method

Abstract

The invention provides a monitoring system and a monitoring method for liquid unloading of a tank truck. The tank car liquid unloading monitoring method comprises the steps that liquid level information of a tank car is measured in real time; acquiring position information of the tank car in real time; according to the liquid level information, whether the tank car is in a liquid discharging state or not is judged; when the tank car is in the liquid discharging state, whether the tank car is located at the preset liquid discharging position or not is judged according to the position information; and when the tank car is not located at the preset liquid discharging position, an alarm signal is sent out. According to the liquid unloading monitoring system and method for the tank truck, the transportation state of the liquid stored in the tank truck can be economically and accurately monitored according to the liquid level information and the position information.

Description

Technical Field

[0001] The present invention relates to the field of vehicle transportation, and particularly to a liquid unloading monitoring system and method for a tank truck. Background Art

[0002] After a tank truck is filled with a liquid medium (such as liquefied natural gas, liquefied petroleum gas, and liquid fuel) at a gas filling station, it is transported by land to a designated target location for unloading for users. During the transportation of the liquid medium, there are situations where drivers or other personnel illegally unload the liquid at non-designated locations and resell it to a third party for profit. Currently, for monitoring whether there is illegal liquid unloading, it is generally judged based on the loading volume and the liquid level during fixed-point liquid unloading. However, due to the instability of the loading volume and factors such as leakage during transportation, it is difficult to judge whether there is illegal liquid unloading based on this.

[0003] Of course, in traditional technologies, some tank trucks can also judge whether there is illegal liquid unloading by monitoring the movement trajectory of the tank truck. However, when there are situations such as traffic jams and detours, it is also impossible to accurately judge whether liquid unloading has occurred. There are also some tank trucks equipped with an electronic fence and an electronic lock. The electronic fence and the electronic lock are separate pieces of information and cannot be matched with the liquid level of the tank truck. Therefore, it is impossible to accurately judge whether the tank truck has unloaded liquid. Summary of the Invention

[0004] An object of the present invention is to solve the deficiencies in the prior art and provide a liquid unloading monitoring system and method for a tank truck that can be relatively economical and accurately monitor the liquid unloading of the tank truck. To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A liquid unloading monitoring method for a tank truck includes:

[0006] Measuring the liquid level information of the tank truck in real time;

[0007] Obtaining the position information of the tank truck in real time,

[0008] Judging whether the tank truck is in a liquid unloading state according to the liquid level information;

[0009] When the tank truck is in a liquid unloading state, judging whether the tank truck is located at the predetermined liquid unloading position according to the position information;

[0010] When the tank truck is not located at the predetermined liquid unloading position, sending out an alarm signal.

[0011] Further, the step of measuring the liquid level information of the tank truck in real time includes judging whether the acquisition frequency of the liquid level information meets a preset requirement. If it does not meet the preset acquisition frequency range, the liquid level information is not processed.

[0012] Furthermore, based on the acquired multiple groups of liquid level information, it is determined whether the changing trends of the multiple liquid level information over time are in a downward trend.

[0013] Furthermore, the step of judging whether the tank truck is in a liquid unloading state based on the liquid level information includes obtaining a change in the liquid level information and judging whether the change in the liquid level information exceeds a threshold.

[0014] Furthermore, the step of judging whether the tank truck is in a liquid unloading state based on the liquid level information further includes calculating the liquid level change speed measured each time and judging whether the liquid level change speed collected each time meets the set conditions.

[0015] Furthermore, in the step of calculating the liquid level change speed of each measurement, the liquid level change speed is calculated as follows: (initial liquid level information-real-time liquid level information) / initial liquid level information.

[0016] Furthermore, the method further includes acquiring temperature change information of the liquid unloading pipeline in real time, and determining whether the temperature change information is greater than a temperature change threshold.

[0017] Furthermore, it also includes:

[0018] According to the position information, it is determined whether the tank truck is in motion. When the tank truck is in motion, no alarm signal is issued.

[0019] A tank truck liquid unloading monitoring system, comprising:

[0020] A liquid level sensor, used for measuring the liquid level information of the tank truck in real time;

[0021] A positioning module, used to obtain the position information of the tank truck in real time;

[0022] The controller determines whether the tank truck is in a liquid unloading state according to the liquid level information, and when the tank truck is in a liquid unloading state, determines whether the tank truck is located at the predetermined liquid unloading position according to the position information;

[0023] The alarm module is electrically connected to the controller. When the tank truck is not located at the predetermined liquid unloading position, the controller controls the alarm module to send out an alarm signal.

[0024] Furthermore, it also includes a temperature sensor installed in the unloading pipeline of the tank truck, and the temperature sensor is used to obtain temperature change information of the unloading pipeline in real time. When the temperature change information is greater than the temperature change threshold, the tank truck is in the unloading state.

[0025] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0026] The above-mentioned liquid unloading monitoring system for tank trucks, according to the liquid unloading monitoring method for tank trucks, first determines whether the tank truck is unloading liquid based on the liquid level information and position information. When the tank truck is in the liquid unloading state, it further determines the geographical location of the tank truck to judge whether it is located at a predetermined liquid unloading position, so as to judge whether the position where the liquid unloading operation occurs is legal. When the liquid unloading position is illegal, it indicates that the liquid unloading operation is an illegal liquid unloading, and an alarm signal is issued, thereby realizing real-time and accurate monitoring of the transportation and liquid storage of the tank truck. Therefore, the above-mentioned liquid unloading monitoring system and monitoring method for tank trucks can avoid misjudgment caused by various special situations. For example, the normal fluctuation of the liquid level during the vehicle driving process, illegal liquid unloading by doping other liquids, etc., and improve the accuracy of monitoring the liquid unloading of the tank truck. Description of the Drawings

[0027] Figure 1 is a flowchart of the liquid unloading monitoring method for a tank truck in an embodiment;

[0028] Figure 2 is Figure 1 a specific flowchart of step S10 of the liquid unloading monitoring method for the tank truck shown;

[0029] Figure 3 is Figure 1 a specific flowchart of step S30 of the liquid unloading monitoring method for the tank truck shown;

[0030] Figure 4 is Figure 3 a flowchart of another embodiment of step S30 of the liquid unloading monitoring method for the tank truck shown;

[0031] Figure 5 is Figure 1 a specific flowchart of step S40 of the liquid unloading monitoring method for the tank truck shown;

[0032] Figure 6 is a schematic diagram of a liquid unloading monitoring system for a tank truck in an embodiment.

[0033] Description of the Reference Numerals is as follows:

[0034] 1. Liquid level sensor; 2. Positioning module; 3. Controller; 4. Alarm module; 5. Temperature sensor. Detailed Embodiments

[0035] Typical embodiments reflecting the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments, all of which do not depart from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes and not for limiting the present invention.

[0036] In the description of the present application, it should be understood that in the embodiments shown in the drawings, the indication of the direction or position relationship (such as up, down, left, right, front and back, etc.) is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. When these elements are in the positions shown in the drawings, these descriptions are appropriate. If the description of the positions of these elements changes, then the indication of these directions also changes accordingly.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0038] A tank truck is used to store liquid fuel to prevent situations such as illegal liquid discharge. This embodiment provides a method for monitoring the liquid discharge of a tank truck. This method for monitoring the liquid discharge of a tank truck can prevent the liquid fuel from being illegally discharged.

[0039] A method for monitoring the liquid discharge of a tank truck can be applied to real-time monitor the transportation process of the tank truck transporting liquid fuel. In the embodiments of the present invention, the tank truck determines whether there is an illegal liquid discharge situation according to the method for monitoring the liquid discharge of the tank truck. When there is a risk of illegal liquid discharge, an alarm signal is issued, and the staff can check and manage the tank truck according to the alarm signal. Therefore, the above method for monitoring the liquid discharge of a tank truck can not only real-time monitor the driving situation of the tank truck during driving, but also monitor the liquid storage tank of the tank truck, improving the safety of the tank truck.

[0040] Specifically in this embodiment, a method for monitoring the liquid discharge of a tank truck includes:

[0041] Please refer to Figure 1 , step S10, measure the liquid level information of the tank truck in real time.

[0042] Install a liquid level sensor in the tank body of the tank truck to monitor the liquid level information of the liquid fuel in the tank body in real time. This liquid level information can be sent to the cloud server or the monitoring end in real time through a wireless network. When the liquid level of the liquid fuel drops or fluctuates, it can be reflected by measuring this liquid level information.

[0043] Please refer to Figure 2, specifically in this embodiment, step S10, the step of measuring the liquid level information of the tank truck in real time, further includes step S12 of determining whether the acquisition frequency of the liquid level information meets the preset requirements. If the preset acquisition frequency range is not met, the liquid level information is not processed.

[0044] The liquid level information of the tank truck is collected at a certain acquisition frequency. If the acquisition frequency is too high, normal fluctuations such as the tank truck shaking during driving will also be collected. This is the noise generated during the acquisition of the liquid level information, and the interference information generated by the shaking should be excluded to avoid affecting the judgment of the change in the liquid level information. If the acquisition frequency is too low, it will also lead to untimely detection. Only after the liquid in the tank truck has been unloaded can the alarm be triggered, and at this time, the purpose of monitoring the liquid storage in the tank truck cannot be achieved either.

[0045] For different models and capacities of tank trucks and storage tanks, the corresponding acquisition frequency can be set accordingly. This acquisition frequency can be set by the user himself. If the user sets a lower acquisition frequency, resulting in a longer acquisition time interval, it will lead to untimely acquisition of the liquid level information, and the acquired liquid level information will not be processed. Therefore, the user can set a lower acquisition frequency so that the liquid level information is not processed. To ensure the effectiveness of the acquired liquid level information, first judge the acquisition frequency of the acquired liquid level information.

[0046] Specifically in this embodiment, the preset acquisition frequency of the liquid level information can be once every 5 minutes. After collecting the liquid level information three times, it can be determined whether the tank truck is in the liquid unloading state. Therefore, after the liquid unloading starts, it can be judged that the vehicle starts to unload liquid after about 15 minutes of delay. It can be understood that the preset acquisition frequency can also be once every 6 minutes, 7 minutes, 8 minutes, etc. The numerical range of the preset acquisition frequency is generally an empirical value and is not specifically limited here.

[0047] For example, when it is judged that the interval between the acquisitions of the liquid level information is greater than 30 minutes, it takes one and a half hours to trigger the liquid unloading alarm. With a delay time of one and a half hours, theoretically the vehicle has already completed the liquid unloading. At this time, triggering the alarm again, the liquid level information has no monitoring significance at this time. Therefore, the acquisition frequency of the liquid level information cannot be greater than 30 minutes.

[0048] Step S20, obtain the position information of the tank truck in real time.

[0049] The tank of the tank truck also needs to be equipped with a Beidou or GPS system to track and confirm the position of the tank truck. The control system is provided with the predetermined liquid unloading position of the tank truck. The predetermined liquid unloading position can be a geographical area within a certain range. The tank truck can only unload liquid normally when it enters this predetermined liquid unloading position.

[0050] Moreover, the control system can be preset with a predetermined trajectory formed by the tanker truck from the starting position to the liquid unloading position. The tanker truck should travel on this predetermined trajectory and not exceed it. It can be understood that this predetermined trajectory can include a certain calibration error, allowing the tanker truck to adjust its driving path within a reasonable calibration error range. Therefore, the control system can monitor the driving trajectory of the tanker truck to avoid the tanker truck exceeding a large range of the predetermined trajectory.

[0051] Step S30: According to the liquid level information, determine whether the tanker truck is in the liquid unloading state.

[0052] Specifically, in this embodiment, step S30 may include the following specific steps:

[0053] Step S31: According to the filling identification information of the tanker truck, determine whether the filling identification information is legal. Whether the tanker truck is in the liquid unloading state.

[0054] The tanker truck can be configured with a filling identification; if the liquid unloading control is achieved through a button, key or other legal operating structure, and the operation method of the operating structure can be directly connected to the network and recognized by the server or the monitoring end, then no alarm is triggered by monitoring the behavior of the operator. When the operating structure is recognized as a normal liquid unloading operation by the server or the monitoring end, no alarm needs to be triggered. No further judgment and monitoring are performed on each monitoring data. When the tanker truck is in the normal liquid unloading state, no monitoring is required for each monitoring parameter of the tanker truck.

[0055] When it is determined that the tanker truck is not in the normal liquid unloading state, when each monitoring parameter of the tanker truck changes, further judgment and monitoring are required. The monitoring parameters may include: liquid level information, geographical location information, temperature information, etc.

[0056] According to the liquid level information that meets the preset acquisition frequency obtained in the above-mentioned liquid unloading monitoring method of the tanker truck, continue with data processing. Specifically, in this embodiment, step S30 further includes:

[0057] Please refer to Figure 3 , step S32: According to the multiple groups of the obtained liquid level information, determine whether the changing trend of the multiple liquid level information over time is in a downward trend.

[0058] When the multiple liquid level information is not successively in a downward trend, the liquid level information is not processed. When the multiple liquid level information is successively in a downward trend, it is still necessary to further determine whether the tanker truck is in the liquid unloading state.

[0059] By collecting the liquid level information data at multiple time points within a certain time period, if the liquid level data at each time point shows a continuous downward trend, it is determined that the tanker truck is in the liquid unloading state. This avoids misjudgment of whether the tanker truck is in the liquid unloading state due to fluctuations in the liquid level information caused by shaking. If the multiple liquid level information does not show a downward trend in sequence, it indicates that there are bumps, uphill slopes, sharp turns, uneven parking positions, etc. during the transportation of the tanker truck, resulting in liquid level fluctuations. Then this liquid level information does not need to be further processed and analyzed.

[0060] Specifically, in this embodiment, step S30 may further include:

[0061] Step S34, obtaining the change amount of the liquid level information according to the liquid level information, and determining whether the change amount of the liquid level information exceeds a threshold.

[0062] When the change amounts of the multiple liquid level information do not exceed the threshold, then this liquid level information is not processed. Then when the change amounts of the multiple liquid level information do not exceed the threshold, it is also necessary to further determine whether the tanker truck is in the liquid unloading state.

[0063] When the multiple liquid level information shows a downward trend in sequence, it indicates that the tanker truck may be in the liquid unloading state, and it is necessary to further determine the liquid level information of the tanker truck.

[0064] Collect the change amount of the liquid level information within a certain time period. If the liquid level change amount meets the preset range, it is determined whether the tanker truck is in the liquid unloading state. For example, when the liquid level change amount is a decrease of 1 cm, or 2 cm, etc., then the tanker truck is in the liquid unloading state, and there may be a behavior of stealing liquid.

[0065] Specifically, in this embodiment, step S30 may further include:

[0066] Step S36, calculating the liquid level change speed for each measurement, and determining whether the liquid level change speed for each monitoring meets the set conditions. If not, then this liquid level information is not processed. If so, it is also necessary to further determine whether the tanker truck is in the liquid unloading state.

[0067] The calculation method of the liquid level change speed is: (initial liquid level information - real-time liquid level information) / initial liquid level information. Wherein, the initial liquid level information is the initial data collected at the start of the measurement. The real-time liquid level information is multiple liquid level information collected in sequence according to the collection frequency during the measurement process.

[0068] For example, the specific method of judgment is as follows: The liquid level is monitored every 5 minutes, or collected at other frequencies. The liquid level information is collected 4 times in sequence to obtain four groups of liquid level information L1, L2, L3, and L4, where L1 is the original liquid level, L2 is the real-time liquid level information collected for the second time, L3 is the real-time liquid level information collected for the third time, and L4 is the real-time liquid level information collected for the fourth time.

[0069] The calculation method of the liquid level change speed can be (L1 - L2) / L1, (L1 - L3) / L1, (L1 - L4) / L1. Calculate whether the liquid level change speed of each monitoring meets the set conditions. If it meets, it means unloading liquid. If it does not meet, it means no unloading. Specifically, in this embodiment, if the liquid level change speed is greater than 3%, it means that the liquid level change speed is relatively fast and reaches the set conditions, then the tanker is in the unloading state.

[0070] In other embodiments, in step S30, during the process of judging whether the tanker is in the unloading state, for judgment steps S32, S34, and S36, one of the steps can also be selected, that is, step S32 or step S34 or step S36. Selecting one of the steps can also achieve the judgment of whether the tanker is in the unloading state.

[0071] Or, during the process of judging whether the tanker is in the unloading state, for judgment steps S32, S34, and S36, any two of the steps can also be arbitrarily selected, that is, step S32 and step S34; step S32 and step S36; step S34 and step S36. It can also achieve the judgment of whether the tanker is in the unloading state.

[0072] Therefore, the specific steps of the specific implementation manner of step S30 are not limited here, as long as it can achieve the judgment of whether it is in the unloading state.

[0073] Specifically, in this embodiment, the storage tank of the tanker stores cryogenic media, such as liquefied natural gas LNG, etc. When the storage tank stores liquid cryogenic media, the liquid unloading monitoring method of the tanker in this embodiment can further include:

[0074] Please refer to Figure 4 , step S38, obtain the temperature change information of the liquid unloading pipeline in real time, and judge whether the liquid unloading temperature change information is greater than the first temperature change threshold. When the temperature change information is less than the first temperature change threshold, the temperature change information is not processed. When the temperature change information is greater than the first temperature change threshold, the tanker may be in the unloading state.

[0075] During the process of discharging cryogenic medium from a tank truck, the temperature of the liquid discharge pipeline will change rapidly. A temperature sensor is installed at the liquid discharge pipeline of the tank body of the tank truck to obtain the temperature change information of the liquid discharge outlet pipeline. When the temperature of the liquid discharge outlet pipeline changes rapidly, the range of the rapid temperature change can be considered to be above 40°C. For example, when discharging LNG, the temperature of LNG is -162°C, and the road ambient temperature is between 0°C and 40°C. When discharging, the temperature of the liquid discharge pipe is generally below -40°C. Therefore, the change in this temperature information is approximately 120°C, which is greater than the temperature change threshold of 40°C. Therefore, it can be determined that the tank truck is in the liquid discharge state.

[0076] Furthermore, the tank truck liquid discharge monitoring method may further include step S39 of obtaining the temperature change information of the liquid inlet pipeline in real time and determining whether the liquid inlet temperature change information is greater than a second temperature change threshold. When the temperature change information is less than the second temperature change threshold, the temperature change information is not processed. When the temperature change information is greater than the second temperature change threshold, the tank truck may be in the liquid discharge state.

[0077] In step S39, by collecting the temperature of the liquid inlet pipeline, the temperature change situation of the liquid inlet pipeline can be obtained in real time. When the temperature change of the liquid inlet pipeline reaches the threshold, the tank truck may be maintaining the liquid level by adulterating during the liquid discharge process.

[0078] Therefore, a temperature sensor is added to the liquid inlet pipeline of the tank body. When the temperature change information of the liquid inlet pipeline changes rapidly and the temperature change information of the liquid discharge pipeline also changes rapidly, it is determined that the tank truck is in the liquid discharge state.

[0079] It should be noted that during the transportation of the tank truck, the liquid discharge pipeline may also leak. During the leakage process, the temperature of the liquid discharge pipe will also change rapidly. At this time, relying solely on temperature monitoring cannot confirm whether it is stealing liquid. Therefore, it is also necessary to combine the judgment of the liquid level information to accurately determine whether it is in the liquid discharge state.

[0080] In other embodiments, when the tank truck is used to transport normal temperature liquid media, such as gasoline, diesel, etc., the temperature of the liquid discharge pipeline and the liquid inlet pipeline does not change during liquid discharge and liquid loading. Therefore, in other embodiments, step S38 and step S39 can also be omitted, and the purpose of determining whether the tank truck is discharging liquid can still be achieved.

[0081] Specifically, in this embodiment, a tank truck liquid discharge monitoring method further includes:

[0082] Please refer to Figure 5, Step S401: Determine whether the tanker truck is in a moving state according to the location information. When the tanker truck is in a moving state, this location information is not processed.

[0083] By judging the change in the position of the tanker truck within a unit time based on the location information, it can be determined whether the tanker truck is in a moving state. The change data of the liquid level when the vehicle is in a moving state is only used for monitoring and not for sending an alarm signal because the probability of liquid unloading when the tanker truck is in a moving state is relatively low.

[0084] By obtaining the location information of the tanker truck in real time, it can be determined whether the tanker truck is in a "moving" or "stopped" state. When the tanker truck is in a moving state, the change data of its liquid level information is only monitored and not processed because the probability of stealing liquid in a moving state is low.

[0085] Step S40: When the tanker truck is in a liquid unloading state, determine whether the tanker truck is located at the predetermined liquid unloading position according to the location information.

[0086] By obtaining the location information of the tanker truck in real time through Step S20, the location of the tanker truck can be directly obtained, enabling a more accurate judgment of the liquid unloading situation of the tanker truck.

[0087] Considering that there are situations such as bumps, uphill slopes, sharp turns, and uneven parking positions during vehicle transportation, all of which can cause changes in the liquid level in the tank. To prevent false alarms caused by rapid changes and resets of the liquid level during bumps, uphill slopes, and sharp turns.

[0088] Step S50: When the tanker truck is not located at the predetermined liquid unloading position, send an alarm signal.

[0089] When the tanker truck is in a stopped state and it is determined through Step S30 that the tanker truck is in a liquid unloading state, further determine the liquid unloading position where the tanker truck is unloading. When the tanker truck is not located at the predetermined liquid unloading position, it indicates that the tanker truck may be illegally unloading liquid, and then trigger an alarm signal.

[0090] The predetermined liquid unloading position can be set through a geofence. A geofence is a virtual fence that encloses a virtual geographical boundary. When the tanker truck enters, leaves, or moves within a specific geographical area, the mobile phone can receive automatic notifications and warnings. With geofence technology, the server system can help users automatically register when entering the predetermined liquid unloading position.

[0091] Therefore, when the liquid unloading position of the tanker truck is not within the geofence, an illegal liquid unloading alarm is triggered. If it is within the geofence, it indicates that the tanker truck is performing normal liquid unloading, and then send a liquid unloading information push to relevant personnel for the management of the liquid unloading situation.

[0092] This embodiment also provides a liquid unloading monitoring system for a tank truck. The liquid unloading monitoring system for the tank truck monitors the liquid storage of the tank truck according to the liquid unloading monitoring method for the tank truck. Please refer to Figure 6 , specifically, the liquid unloading monitoring system for the tank truck includes a liquid level sensor 1, a positioning module 2, a controller 3, an alarm module 4, and a temperature sensor 5.

[0093] The liquid level sensor 1 is used to measure the liquid level information of the tank truck in real time. The above-mentioned liquid level sensor 1 can also directly adopt the liquid level sensor configured in the original tank body. After the controller 3 collects and processes the data of the liquid level sensor 1, it uploads the data to the cloud server.

[0094] The positioning module 2 is used to obtain the position information of the tank truck in real time. The positioning module 2 can be the Beidou or GPS (Global Positioning System) of the global positioning system equipped by the tank truck itself. The position information of the tank truck positioned by Beidou or GPS can be directly uploaded to the server.

[0095] The temperature sensor 5 is used to measure the temperature change information of the tank truck in real time. The temperature sensor 5 includes a first temperature sensor and a second temperature sensor. The first temperature sensor is installed in the liquid unloading outlet pipeline of the tank truck. The first temperature sensor 5 can be the temperature sensor 5 configured for the liquid unloading pipeline of the original tank body. This temperature sensor 5 is used to collect the temperature information of the liquid unloading outlet pipeline of the tank truck. The temperature sensor 5 is used to obtain the temperature change information of the liquid unloading outlet pipeline in real time. When the temperature change information is greater than the temperature change threshold, the tank truck is in the liquid unloading state.

[0096] In other embodiments, the temperature sensor 5 can also be arranged in the liquid inlet pipeline to collect the temperature information in the liquid inlet pipeline. When judging whether the temperature information in the liquid inlet pipeline changes, it can be measured and obtained through the temperature sensor 5. When the temperature change information of the liquid inlet pipeline changes sharply, and the temperature change information of the liquid unloading pipe also changes sharply, but the liquid level information does not change, it is judged that the tank truck is in the state of unloading while filling with adulterated liquid, so the tank truck is also in the liquid unloading state. Therefore, through the detection of the temperature sensor 5, it is possible to avoid maintaining the liquid level by adulterating, avoid misjudging the liquid unloading state of the tank truck, and improve the accuracy of the liquid unloading monitoring system for the tank truck.

[0097] The controller 3 is electrically connected to the liquid level sensor 1, the positioning module 2, and the temperature sensor 5. Then the controller 3 can receive the liquid level information, temperature information, and position information. The controller 3 judges whether the tank truck is in the liquid unloading state according to the liquid level information and temperature information. It can be understood that the controller 3 can be a processor or a cloud processing system, etc.

[0098] When the tank truck is in the liquid unloading state, the controller 3 determines whether the tank truck is located at the predetermined liquid unloading position according to the position information. When the tank truck is located at the predetermined liquid unloading position, it indicates that the liquid unloading operation of the tank truck is a legal liquid unloading. When the tank truck is located at a non-predetermined liquid unloading position, the tank truck is performing illegal liquid unloading.

[0099] The alarm module 4 is electrically connected to the controller 3. When the tank truck is not located at the predetermined liquid unloading position, the controller 3 controls the alarm module 4 to emit an alarm signal. The alarm signal emitted by the alarm module 4 can be the alarm sound of a buzzer, the flashing of an indicator light, or a notification message sent by the system to the terminal, etc. As long as the alarm module 4 can send a prompt signal to the operator or supervisor.

[0100] Therefore, according to the tank truck liquid unloading monitoring method, the above-mentioned tank truck liquid unloading monitoring system can perform real-time monitoring on the transportation and storage of the tank truck, and can avoid various special situations. For example, the normal fluctuation of the liquid level during the vehicle driving process, the illegal liquid unloading by adulterated liquid, etc., which may cause misjudgment of whether the tank truck is in the liquid unloading state, and improve the accuracy of monitoring the liquid unloading of the tank truck.

[0101] The above embodiments are only illustrative examples of the structure. The structures in each embodiment are not fixedly combined structures. Without structural conflicts, the structures in multiple embodiments can be combined and used arbitrarily.

[0102] Although the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be broadly construed within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A method for monitoring the liquid unloading of a tank truck, characterized in that, Including: Real-time measurement of the liquid level information of the tanker truck; Real-time acquisition of the position information of the tanker truck; Judging whether the tanker truck is in the liquid discharging state according to the liquid level information; When the tanker truck is in the liquid discharging state, judging whether the tanker truck is located at a predetermined liquid discharging position according to the position information; When the tanker truck is not located at the predetermined liquid discharging position, an alarm signal is issued.

2. The liquid unloading monitoring method for a tank truck according to claim 1, wherein The step of real-time measurement of the liquid level information of the tanker truck includes judging whether the acquisition frequency of the liquid level information meets the preset requirements. If the preset acquisition frequency range is not met, the liquid level information is not processed.

3. The liquid unloading monitoring method for a tank truck according to claim 1, characterized in that, Judging whether the changing trends of multiple groups of the obtained liquid level information over time are in a downward trend.

4. The liquid unloading monitoring method for a tank truck according to claim 1, characterized in that The step of judging whether the tanker truck is in the liquid discharging state according to the liquid level information includes obtaining the change amount of the liquid level information and judging whether the change amount of the liquid level information exceeds a threshold value.

5. The liquid unloading monitoring method for a tank truck according to claim 1, characterized in that, The step of judging whether the tanker truck is in the liquid discharging state according to the liquid level information further includes calculating the liquid level change speed of each measurement and judging whether the liquid level change speed of each acquisition meets the set conditions.

6. The liquid unloading monitoring method for a tank truck according to claim 5, wherein In the step of calculating the liquid level change speed of each measurement, the calculation method of the liquid level change speed is: (initial liquid level information - real-time liquid level information) / initial liquid level information.

7. The liquid unloading monitoring method for a tank truck according to claim 1, characterized in that, It further includes real-time acquisition of the temperature change information of the liquid discharging pipeline and judging whether the temperature change information is greater than the temperature change threshold value.

8. The liquid unloading monitoring method for a tank truck according to claim 1, characterized in that, It further includes: Judging whether the tanker truck is in a moving state according to the position information. When the tanker truck is in a moving state, no alarm signal is issued.

9. A liquid unloading monitoring system for a tank truck, characterized in that, Including: A liquid level sensor for real-time measurement of the liquid level information of the tanker truck; A positioning module for real-time acquisition of the position information of the tanker truck; A controller for judging whether the tanker truck is in the liquid discharging state according to the liquid level information. When the tanker truck is in the liquid discharging state, judging whether the tanker truck is located at a predetermined liquid discharging position according to the position information; An alarm module electrically connected to the controller. When the tanker truck is not located at the predetermined liquid discharging position, the controller controls the alarm module to issue an alarm signal.

10. The liquid unloading monitoring system for a tanker truck according to claim 9, characterized in that, It further includes a temperature sensor installed in the liquid discharging pipeline of the tanker truck. The temperature sensor is used for real-time acquisition of the temperature change information of the liquid discharging pipeline. When the temperature change information is greater than the temperature change threshold value, the tanker truck is in the liquid discharging state.

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